Insulator.



' No. 797,050.' PATENTED AUG. l5, 1905. W. W.'DUNSMORE.

INSULATGR.

APPLICATION mmm AUG.24,1904.

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INSULATOR.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application led August 24, 1904. Serial No. 222,158.

To a/ZZ whom it 11i/wy concern:

Be it known that I, WILLIAM W. DUNS- MORE, a citizen of the United States, residing at Falconer, in the county of Chautauqua and State of New York, have invented a new and useful Insulator, of which the following is a specification.

This invention relates generally to insulators, and more particularly to an improved construction of an insulator for telephones and telegraph-lines, the object being to provide a cheap and simple form of insulator by means of which the wire can be quickly and easily secured to the cross-arm, and a still further object is to provide an insulator of such construction that when secured the wire will itself be securely connected to the crossarm.

With these objects in view the invention consists in providing the cross-arm with a threaded opening having a slot communicating therewith, said threaded opening being adapted toreceive an externally-threaded sectional insulator-plug, the Wire being arranged between the sections of the said plug, the sections being constructed with mating offset portions for the purpose of securely holding the wire when the plug is screwed into the cross-arm.

The invention consists also in certain details of construction hereinafter fully described, and pointed out in the claim.

In the drawings forming a part of this specification, Figure 1 is a perspective view showing the practical application of my invention. Fig. 2 is a sectional view taken through the cross-arm and plug, and Fig. 3 is a detail perspective view showing the manner of arranging the wire just prior to connecting the plug to the cross-arm.

Referring to the drawings, A indicates an ordinary telegraph, telephone, or other pole, and B the horizontal cross arm or beam connected thereto. This cross arm or beam has one or more horizontal threaded openings C produced therein, and a vertical slot D communicates with each threaded opening C. An externally-threaded insulator-plug E, of glass, porcelain, or any other suitable matel rial, is adapted to be screwed into the threaded opening C for the purpose of securing the wire F, which passes through said opening, being introduced through the slot D. The threaded plug E consists of two longitudinal sections E and E2, and the contiguous faces of these sections are provided or constructed with mating offset portions E3, so that the wire F, which rests in the longitudinal grooves E4, will not pass straight through the plug, but will pass through in a zigzag line, as most clearly shown in Fig. 2, and after the plug is screwed into the threaded socket and the cross-arm it will be impossible to pull the wire longitudinally. The sectional eXter nally-threaded plug is provided with a polygonal-shaped head to facilitate screwing the plug into the cross-arm.

In operation the wire is first passed through the slot D, and the sections of the plug are then brought together for the purpose of gripping the wire, and the said plug with the wire therein is then screwed into the threaded opening in the cross-arm, thereby securely fastening the wire, and it will be noted that at the same time the wire is secured the insulating-plug is also securely connected to the cross-arm, one operation serving to accomplish the two purposes.

By having the cross-arm slotted, as shown at D, the intermediateportion of a wire can be introduced, and it will therefore not be necessary to thread the wire through the cross-arms.

I-Iaving thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The combination with a cross-arm having a threaded opening produced therein provided with a slot communicating with said opening, of an externally-threaded insulatorplug consisting of two longitudinal sections, the contiguous faces of which are provided with mating offset portions, as set forth.

WILLIAM W. DUNSMORE.

Witnesses:

E. DUNsMoRE, CONRAD ANDERSON. 

